:root {
  color-scheme: light;
  --ink: #211e1a;
  --muted: #736b61;
  --paper: #f7f1e7;
  --surface: rgba(255, 253, 248, 0.92);
  --line: #ded4c5;
  --red: #9d2f26;
  --red-dark: #74221c;
  --gold: #b38b4d;
  font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 12%, rgba(179,139,77,.14), transparent 32rem),
    linear-gradient(135deg, #efe6d8 0%, var(--paper) 48%, #eee5d7 100%);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .2;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.7' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.13'/%3E%3C/svg%3E");
}

button, textarea { font: inherit; }
button { cursor: pointer; }
.shell {
  position: relative;
  width: min(960px, calc(100% - 32px));
  min-height: 100vh;
  margin: 0 auto;
  display: grid;
  grid-template-rows: auto 1fr auto;
}
.topbar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: start;
  padding: 42px 4px 24px;
  border-bottom: 1px solid var(--line);
}
.eyebrow { margin: 0 0 8px; color: var(--red); font-size: 12px; letter-spacing: .18em; font-weight: 700; }
h1 { margin: 0; font-family: "Noto Serif SC", SimSun, serif; font-size: clamp(28px, 5vw, 44px); font-weight: 700; letter-spacing: .04em; }
.subtitle { margin: 9px 0 0; color: var(--muted); font-size: 14px; }
.ghost { border: 1px solid var(--line); border-radius: 99px; padding: 9px 15px; background: rgba(255,255,255,.35); color: var(--muted); white-space: nowrap; }
.ghost:hover { border-color: var(--red); color: var(--red); }

.messages { padding: 30px 4px 170px; overflow-wrap: anywhere; }
.message { display: flex; gap: 12px; margin: 0 0 24px; scroll-margin-bottom: 170px; animation: rise .25s ease-out; }
.message.user { flex-direction: row-reverse; }
.avatar { flex: 0 0 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; background: var(--red); color: white; font-family: SimSun, serif; }
.user .avatar { background: #433d36; }
.bubble { max-width: min(760px, calc(100% - 46px)); padding: 15px 18px; background: var(--surface); border: 1px solid var(--line); border-radius: 4px 18px 18px 18px; box-shadow: 0 8px 28px rgba(55,43,27,.05); line-height: 1.75; }
.user .bubble { color: white; background: #3b3732; border-color: #3b3732; border-radius: 18px 4px 18px 18px; }
.bubble p { margin: 0 0 10px; white-space: pre-wrap; }
.bubble p:last-child { margin-bottom: 0; }
.markdown-body { min-width: 0; }
.markdown-body p { white-space: normal; }
.markdown-body > :first-child { margin-top: 0; }
.markdown-body > :last-child { margin-bottom: 0; }
.markdown-body h1, .markdown-body h2, .markdown-body h3,
.markdown-body h4, .markdown-body h5, .markdown-body h6 {
  margin: 1.1em 0 .45em; font-family: inherit; font-size: 1.1em; font-weight: 700; line-height: 1.5; letter-spacing: normal;
}
.markdown-body h1 { font-size: 1.45em; }
.markdown-body h2 { font-size: 1.25em; }
.markdown-body ul, .markdown-body ol { padding-left: 1.6em; margin: .6em 0; }
.markdown-body li { margin: .25em 0; }
.markdown-body li > p { margin-bottom: .35em; }
.markdown-body blockquote { margin: .8em 0; padding: .2em 1em; border-left: 3px solid var(--gold); color: #655a4c; }
.markdown-body code { font-family: Consolas, "Cascadia Code", monospace; font-size: .9em; background: #eee7dc; padding: .1em .3em; border-radius: 4px; }
.markdown-body pre { overflow-x: auto; padding: 14px; border-radius: 8px; background: #eee7dc; line-height: 1.5; white-space: pre; }
.markdown-body pre code { padding: 0; background: none; }
.markdown-body a { color: var(--red-dark); text-underline-offset: 3px; }
.markdown-body hr { border: 0; border-top: 1px solid var(--line); margin: 1em 0; }
.table-scroll { max-width: 100%; overflow-x: auto; margin: .8em 0; }
.markdown-body table { width: 100%; border-collapse: collapse; font-size: .92em; }
.markdown-body th, .markdown-body td { border: 1px solid var(--line); padding: 7px 11px; text-align: left; }
.markdown-body th { background: #f0e8db; font-weight: 650; }
.stream-status { color: var(--red-dark); }
.suggestions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.suggestions button { border: 1px solid #d6c7b2; background: #fbf6ed; color: var(--red-dark); border-radius: 99px; padding: 8px 12px; text-align: left; }
.suggestions button:hover { border-color: var(--red); }
.suggestions button:disabled { opacity: .55; cursor: default; }
.evidence { margin-top: 16px; border-top: 1px solid var(--line); }
.evidence details { border-bottom: 1px solid var(--line); padding: 10px 0; }
.evidence summary { color: var(--red-dark); font-weight: 650; cursor: pointer; }
.quote { margin-top: 9px !important; padding-left: 12px; border-left: 2px solid var(--gold); color: #554e46; font-size: 14px; }
.meta, .limits { color: var(--muted); font-size: 12px; }
.limits { margin-top: 12px !important; }
.citation-diagnostics { margin-top: 12px; padding-top: 10px; border-top: 1px solid var(--line); font-size: 14px; }
.citation-diagnostics summary { cursor: pointer; color: var(--red-dark); font-weight: 650; }
.citation-diagnostics .meta { margin-top: 8px; }
.citation-diagnostics ul { padding-left: 1.4em; margin: 8px 0 0; }
.typing { display: inline-flex; gap: 5px; padding: 6px 0; }
.typing i { width: 7px; height: 7px; border-radius: 50%; background: var(--red); animation: pulse 1s infinite alternate; }
.typing i:nth-child(2) { animation-delay: .2s; }
.typing i:nth-child(3) { animation-delay: .4s; }

.composer {
  position: fixed;
  z-index: 2;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(960px, calc(100% - 32px));
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 16px 18px 12px;
  background: rgba(249,245,237,.9);
  border: 1px solid var(--line);
  border-bottom: 0;
  border-radius: 20px 20px 0 0;
  box-shadow: 0 -12px 40px rgba(55,43,27,.08);
  backdrop-filter: blur(16px);
}
textarea { resize: none; min-height: 48px; max-height: 150px; padding: 12px 14px; border: 1px solid #cfc3b2; border-radius: 12px; background: #fffdf8; color: var(--ink); outline: none; line-height: 1.5; }
textarea:focus { border-color: var(--red); box-shadow: 0 0 0 3px rgba(157,47,38,.08); }
#send { min-width: 76px; border: 0; border-radius: 12px; background: var(--red); color: white; font-weight: 700; }
#send:hover { background: var(--red-dark); }
#send:disabled { opacity: .5; cursor: wait; }
.notice { grid-column: 1 / -1; margin: 0 !important; color: var(--muted); font-size: 12px; }
#status-dot { display: inline-block; width: 7px; height: 7px; margin-right: 7px; border-radius: 50%; background: #b5986d; }
#status-dot.ok { background: #4c875d; }
#status-dot.bad { background: var(--red); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
@keyframes rise { from { transform: translateY(6px); opacity: 0; } }
@keyframes pulse { to { transform: translateY(-4px); opacity: .4; } }
@media (max-width: 640px) {
  .shell, .composer { width: 100%; }
  .topbar { padding: 24px 16px 18px; }
  .subtitle { max-width: 260px; }
  .messages { padding-inline: 12px; }
  .ghost { margin-right: 2px; }
  .composer { border-left: 0; border-right: 0; border-radius: 16px 16px 0 0; }
}